Based on Biot consolidation theory,fluid flow through fractures and fluid-solid coupling theories,a three-dimension model of concrete pavement is established in COMSOL Mutiphysics software to study variation of the pore water pressure through fractures and whether it can exert bad effects on the pavement under the vehicle loads condition. The displacement of pavement,variation trend and dissipating regular of pore water pressure are compared while vehicle passed the reference line of the road under four different pavement conditions,including non-crack,horizonal crack,perpendicular crack and cross crack. The results of numerical analysis show that perpendicular crack has a positive effect on the dissipation of pore water pressure compared to the horizonal one. Pore water pressure reaches peak on the pavement full of horizonal and cross cracks,which damage the road itself to some extent. Fractures have no significant effects on the displacement of the pavement.